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Make/Model Information:

  • Brand:   Hewlett-packard
  • Models included:
    • HP Laserjet 4200
    • HP Laserjet 4250
    • HP Laserjet 4300
    • HP Laserjet 4350

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   650
  • File size:  ∼ 60.50  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMHP-1068

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Table of contents
1 Product information
Chapter contents
Printer configurations
Base model
n model
tn model
dtn model
dtns model
dtnsl models
Model and serial numbers
Printer overview
Hardware components
Interface ports
Software components
Operating systems and printer components
Printer drivers
Drivers included
Additional drivers
Select the correct printer driver for your needs
Printer driver Help
Using the printer drivers
Software for Macintosh computers
HP LaserJet Utility
Hardware specifications
Electrical specifications
Acoustic emissions
Print speed specifications
Operating environment
Media specifications
General guidelines
Supported media weights and sizes
Supported-media specifications tables
Paper and print media
Printing and storage environment
Supported types of media
Guidelines for using paper
Envelope construction
Envelopes with double side-seams
Envelopes that have adhesive strips or flaps
Envelope margins
Envelope storage
Card stock and heavy paper
Card stock construction
Card stock guidelines
Types of media to avoid
Hewlett-Packard limited warranty statement
Print Cartridge Limited Warranty Statement
Service approach
Regulatory information
FCC regulations
Environmental product stewardship program
Protecting the environment
Ozone production
Energy consumption
HP LaserJet printing supplies
Material safety data sheet
For more information
Regulatory statements
Country-/region-specific safety statements
Laser safety statement
Canadian DOC statement
Japanese VCCI statement
Korean EMI statement
Finnish laser statement
2 Installation
Chapter contents
Operating environment
Site requirements
Software installation
3 Operation
Chapter contents
Using the control panel
Control-panel layout
Control-panel lights
Control-panel buttons
Using the printer Help system
Settings and defaults
Setting the control-panel display language
Control-panel menus
Printing control-panel menus
To print a control-panel menu map
To change a control-panel setting
Retrieve Job menu
Information menu
Paper-handling menu
Configure-device menu
Printing submenu
Print-quality submenu
System Setup submenu
Stapler/stacker submenu
I/O submenu
Resets submenu (HP LaserJet 4250/4350 only)
Diagnostics menu (HP LaserJet 4250/4350 only)
4 Maintenance
Chapter contents
Cleaning the printer and accessories
Cleaning the fuser
Running the cleaning page manually
To run the cleaning page manually
Running the cleaning page automatically
To run the cleaning page automatically
Cleaning spilled toner
Performing preventive maintenance
Resetting the maintenance-kit counter (LJ 4200/4300)
Resetting the maintenance-kit counter (LJ 4250/4350)
Maintenance kit part numbers
Expected life of components
Maintaining the stapler unit
To remove and replace the stapler unit
Loading staples
To load staples
Downloading a remote firmware update
Downloading the new firmware to the printer
Remote firmware update through a local Windows port
Windows 95, Windows 98, or Windows Me
Windows NT 4.0, Windows 2000, Windows XP, or Windows Server 2003
Remote firmware update through a Windows network
Remote firmware update for UNIX systems
Remote firmware update using FTP on a direct network connection
Windows operating systems
Mac operating systems
Remote firmware update using FTP through a browser
Remote firmware update using Fetch (Mac OS 8.6 and OS 9.x only)
Remote firmware update using the HP LaserJet utility (Mac OS 8.6 and OS 9.x only)
Remote firmware update using the LPR command
Using HP Web JetAdmin to download the firmware to the printer
Printer messages during firmware update
Troubleshooting a firmware update
5 Theory of operation
Chapter contents
Basic operation of the printer
Printer operating sequence
Control system overview
Pickup-and-feed system overview
Laser/scanner system overview
Image-formation system overview
General descriptions
Dc controller PCA
Motor and fan control
Power supply
Fuser-control circuit
Fuser over-temperature protection
Overcurrent/overvoltage protection
Laser/scanner assembly
Paper-pickup-and-feed system
Pickup-and-feed block
Printing from tray 1
Printing from tray 2
Tray 2, 500-sheet feeder, and 1,500-sheet feeder media-size detection
Lifter-driver operation
Multiple-feed prevention
Media-skew prevention
Fuser/delivery block
Jam detection
Printer pickup delay jam from tray 1
Printer pickup delay jam from tray 2
Printer pickup stationary jam
Printer-delivery wrap jam when feeding regular media
Printer delivery wrap-jam when feeding irregular media
Printer delivery-delay jams
Printer door-open jam
Printer residual-media jam
Printing from the 500-sheet feeder
500-sheet feeder pickup and feeding
Printing from the 1,500-sheet feeder
1,500-sheet feeder pickup and feeding
1,500-sheet feeder lifting mechanism
Envelope feeder
Envelope-feeder pickup and feeding
Envelope feeder jam detection
Envelope feeder pickup delay jam
Envelope feeder pickup stationary jam
Reversing and duplexer pickup
Duplexer jam detection
Stacker and stapler/stacker
Stacker feed and delivery
Stacker jam detection
Stacker-feed jam
Stacker-feed stationary jam
Stacker residual-media jam
Stapler/stacker feed and delivery
Staple-mode feed and delivery
Stapler unit
Stapler-unit operation
Staple level-detection
Stack-mode feed and delivery
Stapler/stacker jam detection
Stapler/stacker feed jam
Stapler/stacker feed stationary jam
Stapler/stacker delivery jam
Stapler/stacker residual media jam
Image-formation system
Electrostatic latent-image formation
Primary charging
Writing the image
Developing the image
Transferring the image
Fusing the image
Cleaning the transfer charging roller and photosensitive drum
Print-cartridge memory chip
Formatter system
PowerSave (LJ 4200/4200L/4300) or Sleep (LJ 4250/4350) Mode
Resolution Enhancement technology
Parallel interface
USB (HP LaserJet 4250/4350 Series printers only)
Embedded ethernet print server (HP LaserJet 4250/4350 Series printers
Expanded I/O
Flash (HP LaserJet 4200/4300 Series printers only)
CompactFlash card (HP LaserJet 4250/4350 Series printers only)
Hard-disk accessory
Printer memory
Read-only memory
Random-access memory
DIMM slots
Firmware DIMM (LJ 4200/4200L/4300 only)
Nonvolatile memory
Memory Enhancement technology
PJL overview
Control panel
6 Removing and replacing parts
Chapter contents
Removal and replacement strategy
Required tools
Before performing service
After completing service
Screws used in the printer
Parts-removal tree
Printer input tray, and cabinet wheel locks
Dc controller PCA diagram
User-replaceable parts
Print cartridge
Transfer roller
Tray 1 pickup roller
Tray 1 separation pad
Tray 2 feed rollers
Covers, tray 1, and the rear output bin
Accessory covers and the tray 2 extension door
Formatter cover
Top cover
Right-side cover
Left-side cover
Front cover
Rear output bin
Control-panel display
Control-panel overlay
Control-panel assembly
Main assemblies
Firmware DIMM (LJ 4200/4300 only)
Formatter assembly
Reinstallation notes, formatter
Installing a new formatter and a new dc controller (LJ 4250/4350 only)
Output-delivery assembly
Duplexing-pendulum assembly
Laser/scanner assembly
Paper-pickup drive assembly
Tray 2 lifter-drive assembly
Dc controller PCA
Reinstallation tip
Installing a new formatter and a new dc controller (LJ 4250/4350 only)
Power supply
Paper-feed belt assembly
Motors and fans
Main cooling fan (left side)
Cooling fan, right side (HP LaserJet 4250/4300/4350 Series printers only)
Removing the fan without removing the air duct
Removing the fan and the air duct together
Print-cartridge motor (HP LaserJet 4250/4300/4350 series printer only)
Main motor
Pickup and feed assemblies
Tray 1 paper-pickup assembly
Paper-feed assembly
Reinstallation notes for the paper-feed assembly
Main drive assembly
Registration assembly
Sensors and switches
Tray 2/500-sheet feeder media-size sensor (PS101)
Tray 2 media-size sensor (PS101)
500-sheet feeder media-size sensor
Tray 1 paper sensor (PS105)
Door switch (SW101)
Solenoids and clutches
Tray 2 pickup solenoid (SL101)
Tray 1 pickup solenoid (SL102)
Feed-roller clutch (CL101)
500-sheet feeder assembly
500-sheet feed rollers
500-sheet feeder right-side cover
500-sheet feeder control PCA
500-sheet feeder lifter-drive assembly
500-sheet feeder paper-pickup drive assembly
1,500-sheet feeder assembly
1,500-sheet feeder feed rollers
1,500-sheet feeder separation roller
1,500-sheet feeder door
1,500-sheet feeder rear cover
1,500-sheet feeder right-side cover
1,500-sheet feeder control PCA
1,500-sheet feeder media-size sensor
1,500-sheet feeder lifter-drive assembly
1,500-sheet feeder paper-pickup drive assembly
7 Troubleshooting
Chapter contents
Troubleshooting process
Initial troubleshooting checklist
Troubleshooting flowchart
Power-on checks
Troubleshooting tools
Information pages
Menu map
Configuration page
Supplies status page
Embedded Web server
Gaining access to the embedded Web server
Information tab
Settings tab
Networking tab
Other links
Printer Status and Alerts software
To select status messages
To view status messages and information
Control-panel menus
Using control-panel menus
Resets submenu
Diagnostics menu
Service menu (service PIN codes)
Service ID
Converting the Service ID to an actual date
Restoring the Service ID
Printer resets and power-on modes
Cold reset
To perform a cold reset
NVRAM initialization
To initialize NVRAM
Hard-disk initialization
To initialize the hard disk
Power-on bypass
Skip disk-load
Test pages
Engine-test page
Formatter test page
Interface troubleshooting
Communications checks
Computer direct connect (parallel) test
EIO troubleshooting
Jetdirect page/Embedded Jetdirect page (HP LaserJet 4250/4350 Series
Display-message troubleshooting
Status messages
Warning messages
Error messages
Critical-error messages
Alphabetical printer messages
Alphabetical printer messages
Numerical printer messages
Numerical printer messages
Paper-path troubleshooting
Jam recovery
To disable the jam recovery
Avoiding jams
Persistent jams
Basic troubleshooting for persistent jams
Data collection
General paper-path troubleshooting
Paper-path checklist
Paper-path test
To perform a paper-path test
Jams in tray 1
Jams in tray 2
Jams in tray 3 or tray 4
Jams in the paper path
Jams in the duplex path
Media transport problems
Multiple pages feed
Media is wrinkled or folded
Media is skewed
Image-formation troubleshooting
Media-related print-quality problems
Overhead transparency defects
Print-quality problems that are related to the environment
Print-quality problems that are related to jams
Image defects
Image quality
Check the print cartridge
Half self-test functional check
Drum-rotation functional check
Image defect tables
Repetitive-defects troubleshooting
Troubleshooting the stacker and the stapler/stacker
Initial checks
Jam errors
Stacker and stapler/stacker paper path
Stacker paper-path test
Stapler/stacker paper-path test
Paper-transport errors
Malfunction errors
Component errors
Printer-component locations
Main printer parts
Printer switches and sensors
Printer motors and fans
Printer PCAs
Accessory component locations
500-sheet feeder main parts
500-sheet feeder switches, sensors, solenoids, and PCAs
1,500-sheet feeder main parts
1,500-sheet feeder switches, sensors, solenoids, and PCAs
Stapler/stacker stapler assembly
Stacker and stapler/stacker switches and sensors
Stacker and stapler/stacker motors and solenoids
Stacker and stapler/stacker PCAs
Printer and accessory wiring diagrams
HP LaserJet 4200 wiring diagram
HP LaserJet 4250 wiring diagram
HP LaserJet 4300 wiring diagram
HP LaserJet 4350 wiring diagram
500-sheet feeder wiring diagram
1,500-sheet feeder wiring diagram
Duplex accessory wiring diagram
Envelope-feeder-accessory wiring diagram
Stacker-accessory wiring diagram
Stapler/stacker-accessory wiring diagram
Dc controller connectors diagram
General timing diagrams
HP LaserJet 4200 general timing diagram
HP LaserJet 4250 general timing diagram
HP LaserJet 4300 general timing diagram
HP LaserJet 4350 general timing diagram
Stapler/stacker timing diagram
8 Parts and diagrams
Chapter contents
Ordering parts and supplies
Related documentation and software
HP-authorized resellers and support
HP service agreements
HP Partner Portal
Consumables and accessories
Memory, fonts, and mass storage
Cables and connectivity
Formatters, laser/scanners, power supplies, and fusers
Assembly locations (1 of 3)
Assembly locations (2 of 3)
Assembly locations (3 of 3)
Internal components
Alphabetical parts list
Numerical parts list
7 Troubleshooting
Chapter contents
? Introduction
Troubleshooting process
Troubleshooting tools
Control-panel menus
Printer resets and power-on modes
Test pages
Interface troubleshooting
Display-message troubleshooting
Paper-path troubleshooting
Media transport problems
Image-formation troubleshooting
Troubleshooting the stacker and the stapler/stacker
Printer-component locations
Accessory component locations
Printer and accessory wiring diagrams
General timing diagrams
Chapter contents 301
In order to use the information in this chapter, you should have a basic understanding of the laserjet
printing process. Explanations of each mechanical assembly, the printer systems, and the basic
theory of operation are contained in chapter 5 of this manual. Do not perform any of these
troubleshooting processes unless you understand the function of each printer component.
This chapter contains the following sections:
Troubleshooting process This section includes an initial troubleshooting checklist and a
troubleshooting flowchart. These contain information about common printer errors that can inhibit
operation or create print-quality problems. They also include recommendations for resolving the
cause of the problem. See
Troubleshooting process.
Troubleshooting tools This section contains information that helps to isolate the cause of
printer failures. This section contains information about printing information and test pages,
resetting printer options, using the diagnostics and service menus, and using the embedded Web
server. See
Troubleshooting tools.
Interface troubleshooting This section provides techniques for isolating the source of
communication problems to the printer hardware, the printer configuration, the network
configuration, or the software program. See
Interface troubleshooting.
Display-message troubleshooting This section explains each control-panel-display message
and suggests recommendations for resolving the cause of each message. When the printer
message indicates a failure for which the root cause is not obvious, use the troubleshooting
process section and the troubleshooting tools section in this chapter to solve the problem. See
Display-message troubleshooting.
Paper-path troubleshooting This section provides information to help solve feed problems,
including print media checks, jam troubleshooting checks, and information about media-caused
and printer-caused jams. See
Paper-path troubleshooting.
Image-formation troubleshooting This section explains methods for solving print-quality
problems. See
Image-formation troubleshooting.
Stacker and stapler/stacker troubleshooting This section provides information about solving
stacker and stapler/stacker problems. See
Troubleshooting the stacker and the stapler/stacker.
Printer and accessory components This section contains illustrations and tables that list the
printer and accessory internal components. See
Printer-component locations and Accessory
component locations.
Printer and accessory wiring diagrams This section contains wiring diagrams for the printers
and accessories. See
Printer and accessory wiring diagrams.
General timing diagrams This section contains timing diagrams for the printer. See
timing diagrams.
302 7 Troubleshooting
Troubleshooting process
When the printer malfunctions or encounters an unexpected situation, information on the printer
control panel alerts you to the situation. This section contains an initial troubleshooting checklist that
helps to eliminate many possible causes of the problem. The subsequent troubleshooting flowchart
helps you to diagnose the cause of the problem. The remainder of the chapter provides steps for
correcting the problems that have been identified.
Use the initial troubleshooting checklist to evaluate the source of the problem and to reduce the
number of steps that are required to fix the problem.
Use the troubleshooting flowchart to pinpoint the cause of malfunctions. The flowchart lists the
section within this chapter that provides steps for correcting the malfunction.
Before beginning any troubleshooting procedure, check the following:
Are supply items (for example, the print cartridge, fuser, and rollers) within their rated life?
Does the configuration page reveal any configuration problems? See
Configuration page.
NOTE The customer is responsible for checking and maintaining supplies, and for using
supplies that are in good condition. The customer is responsible for media and print-cartridge
supplies. The customer is also responsible for replacing the fuser, transfer roller, and all paper
pickup, feed, and separation rollers (tray 1 has a separation pad instead of a roller) that are at
or near the end of their 200,000-page rated life.
Initial troubleshooting checklist
The following checklist contains basic questions that you can ask the customer in order to help
define the problem(s) quickly. For more information about printer and media specifications, see
Model and serial numbers and Media specifications.
Table 7-1 Initial troubleshooting checklist
Environment Is the printer installed in a suitable environment? See Model and serial numbers.
Is the printer installed on a solid, level surface?
Is the supply voltage (from the wall receptacle) within 10% of the printer's rated voltage (see
Model and serial numbers)?
Is the power cord fully seated into both the printer and the electrical receptacle in the wall?
Is the operating environment (for example, the temperature and humidity levels) within the
specified parameters that are listed in chapter 1 (see
Model and serial numbers)?
Is the printer exposed to ammonia gas, such as that produced by diazo copiers or office-cleaning
Is the printer exposed to direct sunlight?
Media Is suitable media being used in the printer? See Supported media weights and sizes and Paper
and print media.
Does the customer use only supported print media?
Is the media in good condition (no curl, folds, or other flaws)?
Troubleshooting process 303


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